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<p>We investigated sediment dynamics in South Africa’s Berg River using in-situ gamma spectrometry and principal component analysis (PCA) of <sup>40</sup>K, <sup>238</sup>U and <sup>232</sup>Th across four sites and bank versus mid-channel profiles. At the four sites, PC1–PC2 explained ~ 80% of variance: PC1 expressed a <sup>238</sup>U–<sup>232</sup>Th contrast (opposite loadings) and PC2 an orthogonal <sup>40</sup>K gradient, with broadly overlapping scores indicating shared composition. Banks showed higher activities, greater dispersion, and ~ 93% of anomalies than the mid-channel. PCA separated Th–U contrasts from largely independent <sup>40</sup>K variability, consistent with margin-side accumulation. In-situ natural radionuclide measurement combined with PCA provides an effective tracer of sediment provenance and accumulation.</p>

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Assessing sediment transport using principal component analysis of natural radionuclides in aquatic environments

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • K. K. Kilel,
  • M. I. Kaniu,
  • J. Bezuidenhout,
  • M. J. Gatari

摘要

We investigated sediment dynamics in South Africa’s Berg River using in-situ gamma spectrometry and principal component analysis (PCA) of 40K, 238U and 232Th across four sites and bank versus mid-channel profiles. At the four sites, PC1–PC2 explained ~ 80% of variance: PC1 expressed a 238U–232Th contrast (opposite loadings) and PC2 an orthogonal 40K gradient, with broadly overlapping scores indicating shared composition. Banks showed higher activities, greater dispersion, and ~ 93% of anomalies than the mid-channel. PCA separated Th–U contrasts from largely independent 40K variability, consistent with margin-side accumulation. In-situ natural radionuclide measurement combined with PCA provides an effective tracer of sediment provenance and accumulation.